(19)
(11) EP 0 019 121 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
07.01.1981 Bulletin 1981/01

(43) Date of publication A2:
26.11.1980 Bulletin 1980/24

(21) Application number: 80102257

(22) Date of filing: 25.04.1980
(84) Designated Contracting States:
DE FR GB

(30) Priority: 15.05.1979 JP 5935779
15.05.1979 JP 5935879
16.05.1979 JP 5995779

(71) Applicant: MITSUBISHI RAYON CO., LTD.
 ()

(72) Inventors:
  • Kazumasa, Kamada
     ()
  • Kazuya, Okada
     ()

   


(54) Process for producing radiation-shielding plastic materials


(57) A radiation-shielding plastic material having an excellent transparency and superior mechanical properties, is produced by polymerizing, in the presence of a lead compound, a mixture of a vinyl monomer component (A) consisting of at least one member selected from alkyl methacrylates and acrylates, hydroxyalkyl methacrylates and acrylates and styrene and an organic acid component (B) containing, as an indispensable ingredient, at least one member selected from the compounds of the formulae (I) through (IV):





and

wherein R1=C1-10 hydrocarbon radical, R2=C1-7hydrocarbon radical, R3 and R4=H or CH3, R5=C2-7hydrocarbon radical, R6=C1-3hydrocarbon radical and n=0~4.





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